Arsenal Biosciences, Inc.
Private companyWARN notices since 2024
2
First: Sep 16, 2025
Workers affected since 2024
158
Across 2 notices
Executive changes, last 12 months
0
0 appointments, 0 departures
Last event
Aug 31, 2026
WARN noticeWARN notice: South San Francisco, CA
Workers affected over time
Cumulative workers in WARN notices since 2024
| Notice date | Workers affected | Cumulative |
|---|---|---|
| Sep 16, 2025 | 100 | 100 |
| Aug 31, 2026 | 58 | 158 |
Leadership
No executive changes on record.
layoffs from Oct 29, 2026
WARN noticeWARN notice: South San Francisco, CA
Arsenal Biosciences, Inc. filed a WARN notice with the California WARN list on Aug 31, 2026 covering 58 workers at 329 Oyster Point Blvd South San Francisco CA 94080. The layoffs take effect on Oct 29, 2026.
Source: California WARN list, filed Aug 31, 2026Site: South San Francisco, CA
Workers affected: 58
layoffs from Nov 14, 2025
WARN noticeWARN notice: CA
Arsenal Biosciences, Inc. filed a WARN notice with the California WARN list on Sep 16, 2025 covering 100 workers. The layoffs take effect on Nov 14, 2025.
Source: California WARN list, filed Sep 16, 2025Site: CA
Workers affected: 100
Last verified Nov 8, 2026